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Optimization of the Use of Spherical Targets for Point Cloud Registration Using Monte Carlo Simulation

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Journal of Geodesy and Geoinformation Science 2024年第2期7卷 18-36页

作者： chan ting on XIAO Hang XIA Linyuan LICHTI Derek D LI Ming Ho DU Guoming School of Geography and Planning Sun Yat-sen UniversityGuangzhou 510275China Guangdong Provincial Key Laboratory of Urbanization and Geo-Simulation Sun Yat-sen UniversityGuangzhou 510275China Guangdong Provincial Engineering Research Center for Public Security and Disasters Sun Yat-sen UniversityGuangzhou 510275China Department of Geomatics Engineering Schulich School of EngineeringUniversity of CalgaryCalgary AB T2N 1N4Canada

Registrations based on the manual placement of spherical targets are still being employed by many professionals in the ***,the placement of those targets usually relies solely on personal experience without scientific evidence supported by numerical *** paper presents a comprehensive investigation,based on Monte Carlo simulation,into determining the optimal number and positions for efficient target placement in typical scenes consisting of a pair of *** demonstrates new check-up statistical rules and geometrical constraints that can effectively extract and analyze massive simulations of unregistered point clouds and their corresponding *** than 6×10^(7) sets of the registrations were simulated,whereas more than IOO registrations with real data were used to verify the results of *** results indicated that using five spherical targets is the best choice for the registration of a large typical registration site consisting of two vertical facades and a ground,when there is only a box set of spherical targets *** a result,the users can avoid placing extra targets to achieve insignificant improvements in registration *** results also suggest that the higher registration accuracy can be obtained when the ratio between the facade-to-target distance and target-to-scanner distance is approximately 3:***,the targets should be placed closer to the scanner rather than in the middle between the facades and the scanner,contradicting to the traditional thought. Besides,the results reveal that the accuracy can be increased by setting the largest projected triangular area of the targets to be large.

关键词： point cloud registration Monte Carlo simulation optimalization spherical target

IGF2/JAK2/STAT3通路在麦芽酚铝致大鼠学习记忆损伤的作用

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现代预防医学 2024年第10期51卷 1865-1871页

作者：贾婧静胡倩贺婵婷牛侨山西医科大学公共卫生学院山西医科大学基础医学院

目的探讨IGF2/JAK2/STAT3通路在麦芽酚铝致大鼠学习记忆损害中的作用机制。方法将32只SD大鼠随机分为生理盐水对照组和低、中、高麦芽酚铝染毒组(10、20和40μmol/kg)四组，腹腔注射，隔天染毒，连续三个月。染毒结束后，采用Morris... 详细信息

目的探讨IGF2/JAK2/STAT3通路在麦芽酚铝致大鼠学习记忆损害中的作用机制。方法将32只SD大鼠随机分为生理盐水对照组和低、中、高麦芽酚铝染毒组(10、20和40μmol/kg)四组，腹腔注射，隔天染毒，连续三个月。染毒结束后，采用Morris水迷宫检测大鼠学习记忆能力，HE染色检测大鼠海马神经元形态。采用实时荧光定量PCR检测海马组织中IGF2 mRNA水平，Western Blotting检测海马组织中Cleaved Caspase3、IGF2、p-JAK2(Tyr1007/1008)、p-STAT3(Ser727)蛋白的相对表达水平。结果随着染铝剂量的升高，各组大鼠同一天逃避潜伏期逐渐延长，目标象限停留时间和穿越平台次数都逐渐减少(F=7.900,P=0.001;F=6.693,P=0.002)。HE染色结果显示，随着染铝剂量的升高海马组织CA1区神经元个数逐渐下降且排列明显松散(F=25.947,P<0.001)。随着染铝剂量增高，凋亡相关蛋白Bcl-2水平逐渐下降(F=83.235,P<0.001),Bax(F=153.189,P<0.001)和Cleaved Caspase3(F=11.636,P<0.01)蛋白的相对表达量逐渐增高，IGF2 mRNA和IGF2、p-JAK2(Tyr1007/1008)、p-STAT3(Ser727)蛋白相对表达量均逐渐减少(F=18.423,P<0.001;F=11.072,P=0.001;F=55.161,P<0.001;F=10.481,P=0.001)。结论麦芽酚铝通过抑制IGF2/JAK2/STAT3通路引起细胞凋亡从而损伤大鼠的学习记忆能力。

关键词：麦芽酚铝细胞凋亡 IGF2/JAK2/STAT3 学习记忆能力

Momentum-space polarization fields in two-dimensional photonic-crystal slabs:Physics and applications

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Chinese Physics B 2022年第10期31卷 23-33页

作者： Wen-Zhe Liu Lei Shi Che-ting chan Jian Zi Department of Physics The Hong Kong University of Science and TechnologyHong Kong 999077China State Key Laboratory of Surface Physics Key Laboratory of Micro-and Nano-Photonic Structures(Ministry of Education)and Department of PhysicsFudan UniversityShanghai 200433China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

In addition to non-radiative guided modes, two-dimensional photonic-crystal slabs support guided resonant ones which can radiate into free space. From the polarization states of these guided resonances, a polarization field on a photonic band can be constructed in momentum space. Momentum-space polarization fields display complicated configurations and patterns with different types of polarization singularities inside, shedding new light on the manipulations of light *** this review, we summarize the recent research progress on momentum-space polarization fields and singularities in two-dimensional photonic-crystal slabs, focusing on their unique optical properties and potential applications as well.

关键词： photonic crystal polarization field polarization singularity

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乳腺颗粒细胞瘤1例报告并文献回顾

中国现代普通外科进展 2024年第8期27卷 664-665页

作者：高尚陈廷婵时光喜刘婷李静蔚孙贻安山东中医药大学附属医院乳腺甲状腺外科山东济南250014 山东中医药大学第一临床医学院山东济南250014 济南市长清区人民医院神经内科山东济南250300

1病例介绍患者女性,38岁,因“查体发现左侧乳腺结节2月”于2021年10月7日入院。患者2个月前于当地查体发现左侧乳腺结节。我院门诊复查乳腺彩超示:左侧乳腺7~8点位10.1 mm×23.9 mm低回声,边界清楚,形态规则,内部回声不均匀,未见明显血... 详细信息

1病例介绍患者女性,38岁,因“查体发现左侧乳腺结节2月”于2021年10月7日入院。患者2个月前于当地查体发现左侧乳腺结节。我院门诊复查乳腺彩超示:左侧乳腺7~8点位10.1 mm×23.9 mm低回声,边界清楚,形态规则,内部回声不均匀,未见明显血流信号(图1)。查体:双乳大致对称,腺体质软,左乳内下扪及2 cm×3 cm肿块,质韧,表面光滑,边界清楚,活动度可,与皮肤无粘连,无压痛;双乳头无凹陷、无溢液;双腋窝及锁骨上下未扪及明显肿大淋巴结。实验室检查:肝肾功、血常规等未见异常。CEA、CA15-3、CA19-9均在正常范围。乳腺X射线摄影:左侧乳腺腺体呈不均匀致密型,内下象限见团块状高密度影,长径约2.4 cm,提示左乳结节BI RADS 3类(图2)。胸部CT示:左侧乳腺内软组织结节影,大小约2.1 cm×1.2 cm(图3)。临床诊断:左乳占位性病变,左乳腺纤维腺瘤?

关键词：乳腺肿瘤颗粒细胞瘤

OSDA-free synthesis of FeZSM-22 zeolite from natural minerals for n-octane hydroisomerization

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Chinese Journal of Chemical Engineering 2024年第2期66卷 51-59页

作者： Tiesen Li ting Chen Yinghui Ye Peng Dong tinghaiWang Qingyan Cui chan Wang Yuanyuan Yue National Engineering Research Center of Chemical Fertilizer Catalyst College of Chemical EngineeringFuzhou UniversityFuzhou 350002China Qingyuan Innovation Laboratory Quanzhou 362801China

A seed-directed approach to synthesizing Fe ZSM-22 zeolite without organic structure directing agent(OSDA)was developed by using Fe-rich diatomite as all aluminum and iron *** Fe ZSM-22zeolite with optimal crystallinity and purity can be obtained by systematically adjusting feed composition and synthesis *** show that Fe ZSM-22 zeolite synthesized with OSDA-free owns high crystallinity,obvious thin needle-shaped morphology and high Bronsted/Lewis acid ***,when used for n-octane hydroisomerization reaction,its derived catalyst exhibits the best catalytic performance reflected by the highest selectivity to C_(8)isomers compared to the two reference catalysts prepared based on a Fe-containing and a Fe-free ZSM-22 synthesized through an OSDA-directed route from natural diatomite and conventional chemicals,*** work provides an alternative route to sustainably synthesizing heteroatomic zeolites with high performance.

关键词： FeZSM-22 zeolite OSDA-free synthesis Natural minerals n-octane hydroisomerization

Antimony oxides-protected ultrathin Ir-Sb nanowires as bifunctional hydrogen electrocatalysts

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Nano Research 2024年第3期17卷 1042-1049页

作者： Bingyan Xu Xuan Huang Shangheng Liu Zhiwei Hu Cheng-Wei Kao ting-Shan chan Hongbo Geng Ying Zhang Xiaoqing Huang Country State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Max Planck Institute for Chemical Physics of Solids Dresden 01187Germany “National Synchrotron Radiation Research Center” Hsinchu 30076TaiwanChina School of Materials Engineering Changshu Institute of TechnologyChangshu 215500China Institute for Carbon Neutralization College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China

Developing electrocatalysts with fast kinetics and long-term stability for alkaline hydrogen oxidation reaction(HOR)and hydrogen evolution reaction(HER)is of considerable importance for the industrial production of green and sustainable ***,an ultrathin Ir-Sb nanowires(Ir-Sb NWs)protected by antimony oxides(SbO_(x))was synthesized as an efficient bifunctional catalyst for both HOR and HER under alkaline *** from the much higher mass activities of Ir-Sb nanowires than those of Ir nanowires(Ir NWs)and commercial Pt/C,the SbO_(x) protective layer also contributes to the maintenance of morphology and anti-CO poisoning ability,leading to the long-term cycling performance in the presence of ***,the Ir-Sb NW/SbO_(x) exhibits the highest catalytic activities,which are about 3.5 and 4.8 times to those of Ir NW/C and commercial Pt/C toward HOR,*** work provides that the ultrathin morphology and H_(2)O-occupied Sb sites can exert the intrinsic high activity of Ir and effectively optimize the absorption of OH*both in alkaline HER/HOR electrolysis.

关键词： Ir nanowire amorphous antimony oxides bifunctional mechanism hydrogen evolution reaction hydrogen oxidation reaction

Merging bound states in the continuum by harnessing higher-order topological charges

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Light(Science & Applications) 2022年第9期11卷 2098-2106页

作者： Meng Kang Li Mao Shunping Zhang Meng Xiao Hongxing Xu Che ting chan School of Physics and Technology and Key Laboratory of Artificial Micro-and Nano-structures of Ministry of EducationWuhan UniversityWuhan 430072China Department of Physics The Hong Kong University of Science and TechnologyHong KongChina Wuhan Institute of Quantum Technology Wuhan 430206China School of Microelectronics Wuhan UniversityWuhan 430072China

Bound states in the continuum(BICs)can confine light with a theoretically infinite Q ***,in practical on-chip resonators,scattering loss caused by inevitable fabrication imperfection leads to finite Q factors due to the coupling of BICs with nearby radiative *** multiple BICs can improve the robustness of BICs against fabrication imperfection by improving the Q factors of nearby states over a broad wavevector *** date,the studies of merging BICs have been limited to fundamental BICs with topological charges±*** we show the unique advantages of higher-order BICs(those with higher-order topological charges)in constructing merging *** multiple BICs with a higher-order BIC can further improve the Q factors compared with those involving only fundamental *** addition,higher-order BICs offer great flexibility in realizing steerable off-T merging BICs.A higher-order BIC at F can split into a few off-T fundamental BICs by reducing the system *** split BICs can then be tuned to merge with another BIC,e.g.,an accidental BIC,at an off-Γ*** the in-plane mirror symmetry is further broken,merging BICs become steerable in the reciprocal *** BICs provide a paradigm to achieve robust ultrahigh-Q resonances,which are important in enhancing nonlinear and quantum effects and improving the performance of optoelectronic devices.

关键词： topological charges states

Character Sheaves for Classical Graded Lie Algebras

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Acta Mathematica Sinica,English Series 2024年第3期40卷 870-884页

作者： ting XUE School of Mathematics and Statistics University of MelbourneVIC 3010Australia Department of Mathematics and Statistics University of HelsinkiHelsinki 00014Finland

In this note we study character sheaves for graded Lie algebras arising from inner automorphisms of special linear groups and Vinberg’s type Ⅱ classical graded Lie algebras.

关键词： Graded Lie algebras character sheaves Fourier transform nilpotent orbits

Experimental realization of chiral Landau levels in two-dimensional Dirac cone systems with inhomogeneous effective mass

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光:科学与应用(英文版) 2023年第8期12卷 1616-1622页

作者： Hongwei Jia Mudi Wang Shaojie Ma Ruo-Yang Zhang Jing Hu Dongyang Wang Che ting chan Department of Physics the Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina Institute for Advanced Study the Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina Department of Physics University of Hong KongHong KongChina

Chiral zeroth Landau levels are topologically protected bulk *** particle physics and condensed matter physics,the chiral zeroth Landau level plays a significant role in breaking chiral symmetry and gives rise to the chiral *** experimental works on such chiral Landau levels are mainly based on three-dimensional Weyl degeneracies coupled with axial magnetic *** realizations using two-dimensional Dirac point systems,being more promising for future applications,were never experimentally realized *** we propose an experimental scheme for realizing chiral Landau levels in a two-dimensional photonic *** introducing an inhomogeneous effective mass through breaking local parity-inversion symmetries,a synthetic in-plane magnetic field is generated and coupled with the Dirac ***,the zeroth-order chiral Landau levels can be induced,and the one-way propagation characteristics are experimentally *** addition,the robust transport of the chiral zeroth mode against defects in the system is also experimentally *** system provides a new pathway for the realization of chiral Landau levels in two-dimensional Dirac cone systems,and may potentially be applied in device designs utilizing the chiral response and transport robustness.

关键词： chiral Landau realization